Technical skills and training of upper gastrointestinal endoscopy for new beginners

Figure 14 Intubation from hypopharynx to upper esophagus. A-E: Images were continuously taken during the advancement of the scope through the left-sided pyriform fossa into the upper esophagus. Although it appears to have a blind ending shape, upon further examination, a tiny furrow will be observed. With air insufflation and by a little bit of force, the scope can be moved into the upper esophagus, despite resistance from its sphincter; F, G: In this process, a red-out sign can occur. Continue to insert the scope gradually and carefully while observing the surface in the process of the advancement into the lumen.